Extensible Firmware Interface - meaning and definition. What is Extensible Firmware Interface
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What (who) is Extensible Firmware Interface - definition

SPECIFICATION THAT DEFINES A SOFTWARE INTERFACE BETWEEN AN OPERATING SYSTEM AND PLATFORM FIRMWARE
Uefi; Unified Extensible Firmware Interface; EFI Developer Kit; Compatibility Support Module; Compatibility support module; Extensible Firmware Interface; Windows 8 secure boot; Secure Boot; UEFI Secure Boot; Secureboot; Pkek; UEFI shell; OVMF; Open Virtual Machine Firmware; EFI Byte Code; UEFI disk device compatibility; UEFI Compatibility Support Module; UEFI CSM; Graphics Output Protocol; UEFI Graphics Output Protocol; UEFI GOP; CompatibilitySmm; UEFI System Management Mode; UEFI SMM; UEFI CompatibilitySmm; UEFI handover; UEFI boot stub; EFI handover; EFI boot stub; Intel boot initiative; Intel Boot Initiative; EDK2 Application Development Kit; EADK; UEFI secure boot; UEFI application; UEFI boot manager; EFI byte code; Restricted boot; UEFI firmware; UEFI variable; EFI variable; Restricted Boot; SHELLX64.EFI; Uefi.org; UEFI BIOS
  • Interaction between the EFI boot manager and EFI drivers
  • InsydeH2O, an UEFI implementation
  • Example of an active Secure Boot as detected by [[rEFInd]] boot manager
  • Examples of custom Secure Boot public keys
  • MokManager, a part of Shim bootloader
  • Boot process
  • Example of an UEFI shell 2.2 session
  • Example of UEFI variables

Unified Extensible Firmware Interface         
The Unified Extensible Firmware Interface (UEFI)Pronounced as an acronym or as . is a publicly available specification that defines a software interface between an operating system and platform firmware.
Extensible Firmware Interface         
<specification> (EFI) A specification originating from {Intel Corporation}, defining the interface between an {operating system} and platform firmware, and aiming to reduce OS dependence on details of the firmware implementation. EFI Home (http://intel.com/technology/efi/). (2004-10-23)
Custom firmware         
UNOFFICIAL NEW OR MODIFIED VERSION OF FIRMWARE CREATED BY THIRD PARTIES ON DEVICES SUCH AS VIDEO GAME CONSOLES AND VARIOUS EMBEDDED DEVICE TYPES TO PROVIDE NEW FEATURES OR TO UNLOCK HIDDEN FUNCTIONALITY
ECFW; Custom Firmware; Aftermarket firmware; ROM flashing
Custom firmware, also known as aftermarket firmware, is an unofficial new or modified version of firmware created by third parties on devices such as video game consoles and various embedded device types to provide new features or to unlock hidden functionality. In the video game console community, the term is often written as custom firmware or simply CFW, referring to an altered version of the original system software (also known as the official firmware or simply OFW) inside a video game console such as the PlayStation Portable, PlayStation 3, PlayStation Vita/PlayStation TV, PlayStation 4, Nintendo 3DS and Nintendo Switch.

Wikipedia

UEFI

UEFI (Unified Extensible Firmware Interface) is a set of specifications written by the UEFI Forum. They define the architecture of the platform firmware used for booting and its interface for interaction with the operating system. Examples of firmware that implement these specifications are AMI Aptio, Phoenix SecureCore, TianoCore EDK II and InsydeH2O.

UEFI replaces the BIOS which was present in the boot ROM of all personal computers that are IBM PC-compatible, although it can provide backwards compatibility with the BIOS using CSM booting. Intel developed the original Extensible Firmware Interface (EFI) specifications. Some of the EFI's practices and data formats mirror those of Microsoft Windows. In 2005, UEFI deprecated EFI 1.10 (the final release of EFI).

UEFI is independent of platform and programming language, but C is used for the reference implementation TianoCore EDKII.